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Proceedings Paper

Experimental implications of focal-plane behavior of Gaussian and top-hat beams
Author(s): Sallie S. Townsend; Philip R. Cunningham
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Paper Abstract

The location of focal planes and waists can be calculated using the equivalent Gaussian beam method. Predictions can be made for both Gaussian and top-hat (flat phase, flat irradiance profile) beams. A Fresnel number relationship is given where the waist of top-hat beams can be either within or outside the far field region. Experimental implications of this focal plane shift for top-hat and gaussian beams are discussed. The most important implication is that calculated reference power-in-the-bucket curves, used to calculate beam quality, may be off as much as 5% for top-hat beams, when not taking into account focal shifts for some optical systems.

Paper Details

Date Published: 1 June 1992
PDF: 25 pages
Proc. SPIE 1625, Design, Modeling, and Control of Laser Beam Optics, (1 June 1992); doi: 10.1117/12.58967
Show Author Affiliations
Sallie S. Townsend, United Technologies Research Ctr. (United States)
Philip R. Cunningham, United Technologies Industrial Lasers (United States)

Published in SPIE Proceedings Vol. 1625:
Design, Modeling, and Control of Laser Beam Optics
Youssef Kohanzadeh; George N. Lawrence; John G. McCoy; Hugo Weichel, Editor(s)

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